My contribution to the BAA I&I meeting in Northamton on 1999 May 15 was on relay lenses to 'brighten' spectra via ultra-low dispersion: a blazed transmission grating [like Rainbow Optics - 200 lines/mm] in a convergent beam forms a spectrum to one side of the real image as a slit-less spectroscope but there is a physical limit to how close the grating can be from the chip surface. A relay/ transfer lens resolves this by projection via a Kellner eyepiece to lower dispersion from 4nm/pixel to 12nm./pixel with exposures reduced to at least 1/3rd. Only bold features like strong absorption bands [in SNe 1a and Mira stars] are recorded and none of the common Balmer lines. A weak prism before the grating [forming a 'grism'] giving zero deviation for the mid [green] spectral region would minimises vignetting and coma for an improved optical performance. Colleague Edward Palmer [Nat Phys Lab - Teddington - UK] suggested a relay lens in this application.